I think that I may have found my answer. I've been searching past posts here and found something similar. Will give it a try.

kc

 

are you squeezing it too tight?

 

Being as experienced as you are with mig, I know what I would do.

 

That's what I ended up doing. Drilled small holes and mig'ed them.

 

Some advice on the HF spot welder. Everyone talks about pressure Did you try this,that,etc. If that sucker don't weld from the start take it back and get another one. The first one I had didn't work at all and I tried everything. I returned it to the store and got another. I've had it over 2 years now and works like a champ. I've read sometimes they have a bad switch and don't produce enough heat where needed. The welder will get hot as hell but not enough at the tongs. Just my 2 cents but that worked for me.

 

Yea sounds like you've got a problem with the welder itself.

 

I had the same issue, turned out to be a power problem. House wall socket/plug and system just could`t handle it(to far from elect. box)...I cut off the plug and soldered battery charger clips to the ends and then clipped them directly to the wires coming into the electrical box. Worked like a charm ! but I would`t do it if you`r not familiar with house electric ?